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Poster: A/V Geek Skip Date: Jun 4, 2005 6:44am
Forum: movies Subject: Re: there are many many other public domain movies and TV shows

This is correct. Extra materials, colorization of materials, even extra footage added to a film can qualify for new copyrights.


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Poster: Date: Jul 1, 2005 7:23am
Forum: movies Subject: Check for hidden watermarks?

Does anybody know of a way to check for hidden watermarks in movies? claims to use hidden watermarks in their downloadable films and that it's against there usage policy to use them for anything other than personal use.

I was wondering if DVD producers did the same thing? All of these dollar DVDs containing public domain material are showing up, but they all claim to have a copyright on the material. Is there a way to check that they aren't including hidden watermarks or should this even be a concern?

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Poster: Rob Pascual Date: Jul 2, 2005 4:22am
Forum: movies Subject: Re: Check for hidden watermarks?

There have been some DVD watermarking techiniques developed, but they seem to be mostly used for screeners sent out to film previewers. In low print runs like that, they can make individual watermarks to track down who leaked a movie. In large pressings however, there is no (economically viable) way to encode unique watermarks. It is possible that someone would encode a static watermark across an entire pressing, but I don't really see what this would accomplish, so I doubt it is a concern.

There are also very successful audio watermarking techinques, usually based on a spectrogram, that can persist through lossy encodings. However, these are also mainly used for CD previews.